Let's start with an easy one: Any true fan of Tom Cruise already knows that Cruise is actually the A-list actor's middle name. His full name is Thomas Cruise Mapother IV. (And here's a bonus: His cousin William Mapother portrayed Ethan Rom on "Lost.")

Let's start with an easy one: Any true fan of Tom Cruise already knows that Cruise is actually the A-list actor's middle name. His full name is Thomas Cruise Mapother IV. (And here's a bonus: His cousin William Mapother portrayed Ethan Rom on "Lost.")